// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/run_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "cc/base/unique_notifier.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace cc {
namespace {

    class UniqueNotifierTest : public testing::Test {
    public:
        UniqueNotifierTest()
            : notification_count_(0)
        {
        }

        void SetUp() override { ResetNotificationCount(); }

        void Notify() { ++notification_count_; }

        int NotificationCount() const { return notification_count_; }

        void ResetNotificationCount() { notification_count_ = 0; }

    protected:
        int notification_count_;
    };

    TEST_F(UniqueNotifierTest, Schedule)
    {
        {
            UniqueNotifier notifier(
                base::ThreadTaskRunnerHandle::Get().get(),
                base::Bind(&UniqueNotifierTest::Notify, base::Unretained(this)));

            EXPECT_EQ(0, NotificationCount());

            // Basic schedule should result in a run.
            notifier.Schedule();

            base::RunLoop().RunUntilIdle();
            EXPECT_EQ(1, NotificationCount());

            // Multiple schedules should only result in one run.
            for (int i = 0; i < 5; ++i)
                notifier.Schedule();

            base::RunLoop().RunUntilIdle();
            EXPECT_EQ(2, NotificationCount());

            // Schedule and cancel.
            notifier.Schedule();
            notifier.Cancel();

            base::RunLoop().RunUntilIdle();
            EXPECT_EQ(2, NotificationCount());

            notifier.Schedule();
            notifier.Cancel();
            notifier.Schedule();

            base::RunLoop().RunUntilIdle();
            EXPECT_EQ(3, NotificationCount());

            notifier.Schedule();
        }

        // Notifier went out of scope, so we don't expect to get a notification.
        base::RunLoop().RunUntilIdle();
        EXPECT_EQ(3, NotificationCount());
    }

} // namespace
} // namespace cc
